Well got my 425 back up and running. Broke in the cam and everything seemed to be running well. Here's some pictures.

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So like I said it was running good and sounding good. But then about 2 days later i start her up and she's popping through the carb when given gas. Checked my timing and all my ignition. Fearing the worse that the cam break in didn't go as good as I though I pulled the drivers valve cover and found this.

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Anybody see a problem here lol guess I should have changed the rockers while I was in there.

 

Yep. Always a good idea.

 

Ouch! The nice part it's an easy fix.

 

Ouch.

Valve still moving freely? Pushrod bent?

- Eric

 

Valve is fine and so are the pushrods.

Anybody have a suggestion about what rockers to use that are not too pricey. Was planning on eventually going with aluminum heads so don't want to put too much into these heads. These are A heads so they use a 3 piece rocker. Thanks guys!

 

The rocker itself should be the same as any other.
No worries, off to the parts store.

 

Having a harder time finding a stock style rocker for 3/8" pedestal mount. Everybody seems to have 5/16. Anybody used these before don't seem to specify stud size.

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Post a parts request under parts wanted. I'm sure someone has valve train parts for your engine.

 

If all you need is a rocker (or 2) I have a motors worth left as I converted to rollers.
Yours for the postage.

David

 

Okay this thing is driving me nuts. Put on a new stock rocker I was able to get at a parts store nearby and drove the car for maybe a total of 15 miles and bam same issue. Even happened to the same rocker. Brand new stock rocker and push rod punched through. I'm lost, any idea what's happening?

 

Ruh-Roh.

Are you sure that oil is coming up through the lifter and the pushrod?

How much preload do you have on that lifter?

- Eric

 

what size carb do u have on ur motor 750? I would change over to roller rockers

 

is the retainer hitting the valve guide?

 

What lift on the cam?

 

I had a lifter do that one time, had a stuck the spring check & it wouldn't pump/unload. Acted like there was no spring in it.Might be good idea to check/change the lifter out. IMHO

Brett

 

Haven't checked if oil is coming up through the pushrod. Not sure on preload because valve train is not adjustable. Stock springs and rockers.

I have an 850 demon carb with vacuum secondaries. I would go roller rockers but was planning on eventually going with aluminum heads so didn't really wanna put anymore money into these heads.

I don't think the retainer is hitting the valve guide. These heads were on the motor previously and ran fine. Only things that have changed valve train wise are lifters and pushrods.

 

Cam has .504 lift, it is an erson tq40h cam. Might be leaning towards the idea of the lifter not pumping oil up. How would I check that?

 

Okay so went out to the car today. Replaced the rocker arm and unhooked the 12v from the distributor. I started cranking the motor. When cranking the motor for about 15 seconds at a time I was not seeing any oil coming up through any of the pushrods on the driver side head. I thought that seemed odd so did it about 2 more times for 15 seconds each and nothing. I then started the car and after running for about 15-20 seconds I eventually some oil start to come through 2 pushrods (one of them was the one that has kept breaking, thought that was odd.) and then I shut down the motor. Should I be getting oil this slow up to the rockers? My oil pressure gauge is reading 50psi+ and it is hooked into the factory location at the timing cover. What would cause this if that is a problem?

 

As long as there's some oil, you're okay. Olds do not throw oil out the pushrods like some other brands that begin with a "C."

At least you've crossed that possibility off the list.

Maybe you can run the engine for a minute or two - enough to be sure that all the lifters are pumped up - and then rotate the crank with a wrench and measure how far depressed the valve spring is on that valve, compared to a few others. The coils of the spring should not be touching each other when fully depressed.

- Eric

 

Actually Eric they do. Hence the continuous discussion about Olds engines sucking the pan dry, needing restricted pushrods etc. The discussion has always been twofold, too much oil pumped thru the pushrods or inadequate drainbacks.


However as Eric mentioned you need to check for coil bind. does it run ok otherwise? If a lifter wasn't bleeding down at all then you'd most likely have a valve hanging open, with subsequent running issues.


Hope this helps.

 

Just let the motor idle for about 45 seconds with the valve cover off and by the end of that time it was pumping oil up pretty good as the idle picked up and car started to warm up. So lifters seem okay. For checking coil bind am I taking out plugs and turning over the motor and checking for resistance on each valve? This seems odd to me to have all this trouble with the valve train because my erson tq40h is listed as compatible with stock valvetrain.

 

It is, done lots of these, no issues till now.
Check for bind everywhere. The best way is to remove that spring assembly. If that lifter is allowed to bleed down a bit it'll give you a false result, the valve won't open as far when it's running so your results will be skewed.
Can you see if the valve seal is still good?


Thanks.

 

New development in my 425 engine issue saga lol. Went out today to check for coil bind and I pulled the pushrod and found this.20141111_171636_zpsbiunvhuf.jpg

Last night when I pulled the pushrod to check for blockage in the oil passage it was perfectly straight. So when I ran it for those 45 seconds to check oiling it must have bent. I'm giving up and buying some aluminum heads lol

 

I'm thinking coil bind or the retainer is hitting the guide.

 

Update: definitely an issue with the heads and coil bind. So bit the bullet a little early and ordered a new set of aluminum heads from Bernard mondello. Premium package with edelbrock valves and mild porting. Should work out nice. I'll update once they arrive.

 

39 or 45 degree bank angle motor ? i'm thinking of building one, wondering if that might be an issue.
Thanks Willie

 

I had this same issue on my first mild performance small block Olds circa 1992, too much lift for stock fixed position rockers. I still have the pieces in my shop,...I still remember my buddy inverting and playing with them like dancing shoes, (Think Johnny Depp in "Benny and Joon") Changed out the valve train to Comp Cams adjustable roller tips, no more problems..

 

45 degree block.

 

Might be alittle late but smity on this board. Advertised a few different set ups on the pro comp heads seemed like a good price when I was looking

 

Where did you get the 45 degree cam thinking of having Luniti grinding one for me?

 

Got the cam from Mark on this site (cutlassefi)

 

Just got my new heads from Bernard Mondello in today. Heads, gaskets, fuel pump... They look amazing. Pics to follow.

 

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delete

 

You need to link to the image, not the page.

Like this:

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- Eric